Author donkopotamus
Recipients donkopotamus, fdrake, pitrou, rhettinger, serhiy.storchaka, stutzbach
Date 2017-04-19.22:18:59
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Just to add, I framed this slightly wrongly by using a list [] as an example, whereas my original motivating case was objects that are hashable but not weakly referenceable.   (eg () ).

So there are two cases to consider ... what to do in discard/remove etc when the value is (i) not weakly referenceable, and (ii) when the value is not hashable.
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